Photon v1.15.0: Lemmy 0.19.0 support!

Photon v1.15.0 comes with Lemmy v0.19.0 support, and is backwards compatible with v0.18.0 instances.

• feat: add v0.19.0 support
• feat: add seasonal logo colors
  • I plan to add some colors on hover depending on the month. Since this month is spooky month, it's an orange to purple gradient!
• design: make search buttons look much better
• misc: fix some signup issues

Full Changelog: https://github.com/Xyphyn/photon/compare/v1.15.0...v1.15.1